EP0405127B1 - Druckluftmotor - Google Patents

Druckluftmotor Download PDF

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Publication number
EP0405127B1
EP0405127B1 EP90109490A EP90109490A EP0405127B1 EP 0405127 B1 EP0405127 B1 EP 0405127B1 EP 90109490 A EP90109490 A EP 90109490A EP 90109490 A EP90109490 A EP 90109490A EP 0405127 B1 EP0405127 B1 EP 0405127B1
Authority
EP
European Patent Office
Prior art keywords
spring
rod
piston
drive rod
piston rod
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP90109490A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0405127A1 (de
Inventor
Ferdinand Dipl.-Ing. HTL. Gübeli
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Wagner International AG
Original Assignee
Wagner International AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Wagner International AG filed Critical Wagner International AG
Priority to AT90109490T priority Critical patent/ATE87707T1/de
Publication of EP0405127A1 publication Critical patent/EP0405127A1/de
Application granted granted Critical
Publication of EP0405127B1 publication Critical patent/EP0405127B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L25/00—Drive, or adjustment during the operation, or distribution or expansion valves by non-mechanical means
    • F01L25/02—Drive, or adjustment during the operation, or distribution or expansion valves by non-mechanical means by fluid means
    • F01L25/04—Drive, or adjustment during the operation, or distribution or expansion valves by non-mechanical means by fluid means by working-fluid of machine or engine, e.g. free-piston machine
    • F01L25/06—Arrangements with main and auxiliary valves, at least one of them being fluid-driven
    • F01L25/063—Arrangements with main and auxiliary valves, at least one of them being fluid-driven the auxiliary valve being actuated by the working motor-piston or piston-rod
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01B—MACHINES OR ENGINES, IN GENERAL OR OF POSITIVE-DISPLACEMENT TYPE, e.g. STEAM ENGINES
    • F01B11/00—Reciprocating-piston machines or engines without rotary main shaft, e.g. of free-piston type
    • F01B11/001—Reciprocating-piston machines or engines without rotary main shaft, e.g. of free-piston type in which the movement in the two directions is obtained by one double acting piston motor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01B—MACHINES OR ENGINES, IN GENERAL OR OF POSITIVE-DISPLACEMENT TYPE, e.g. STEAM ENGINES
    • F01B17/00—Reciprocating-piston machines or engines characterised by use of uniflow principle
    • F01B17/02—Engines
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L31/00—Valve drive, valve adjustment during operation, or other valve control, not provided for in groups F01L15/00 - F01L29/00
    • F01L31/02—Valve drive, valve adjustment during operation, or other valve control, not provided for in groups F01L15/00 - F01L29/00 with tripping-gear; Tripping of valves

Definitions

  • the invention relates to an air motor according to the preamble of claim 1.
  • Such an air motor is known from EP-A-0 143 428.
  • the timely switching of the compressed air inlets located on both sides of the engine piston takes place by means of a reversing valve attached to the side of the engine cylinder, the valve stem of which has two valve bodies and runs parallel to the direction of the engine piston movement and which goes back and forth via a cross lever from a shift rod running coaxially to the engine piston rod is moved.
  • the shift rod in turn is connected to the piston rod by means of a spring towing device in such a way that it is dragged along by it in both directions of piston movement.
  • a spring snap device acts on this piston rod, which immediately before the two end positions of the engine piston of the shift rod transmits an accelerated movement leading the piston rod, with the result of an essentially sudden changeover of the reversing valve.
  • the spring snap device consists of spring-loaded shift levers attached to the housing, which are directed transversely to the shift rod and pivotably mounted thereon.
  • the known known air motor works perfectly, but it has been shown that the friction on the spring support of the shift lever of the spring snap device leads to a comparatively quick wear of these parts. The exactness of the snap processes also leaves something to be desired, especially after prolonged use of the air motor and the material fatigue of the springs that begins.
  • an air motor is known from EP 29 826, in which the shift rod runs parallel to and at a distance from the piston rod and is dragged by the piston rod by tension springs and by a spring snap device in the form of a wire spring clip is applied.
  • this air motor comparatively rapid wear occurs not only on the spring snap device but also on the spring drag device; moreover, these spring arrangements can hardly be used when an air motor with a shift rod running coaxial to the piston rod or even with a reversing valve arranged coaxially with the piston rod is desired.
  • the object of the present invention is therefore to improve the air motor of the type mentioned above so that the friction and thus the wear of the spring elements of the spring snap device are significantly reduced, but nevertheless an exact reversing process is ensured and with regard to the arrangement of the piston rod, shift rod and Reversing valve to each other is given considerable design freedom.
  • the solution to this problem results from the characterizing features of patent claim 1.
  • the spring snap device according to the invention has the advantage that it is subjected to only a small amount of friction and thus only a small amount of wear, is structurally small, compact and stable and can be used with success regardless of whether the reversing valve is parallel or transverse to the engine cylinder or is arranged coaxially to the piston rod in an extension thereof.
  • the air motor works as follows:
  • the engine piston 11 is alternately inflowing at 18 and 19 (and not shown, known exhaust openings escaping) compressed air is subjected to an up and down movement, which can be transmitted via the piston rod 12 to an element to be driven, for example a pump piston.
  • the engine piston 11 is in its upper end position and the reversing valve 13 has already been switched over so that the valve stem 14 is in its upper position, in which the reversing valve 13 opens the inlet 18 and closes the lower inlet 19, whereby this 1 and 2, the piston 11 then begins to move downward as a result of the compressed air flowing in through the inlet line 18. This also moves the piston rod 12 downward, while the shift rod 21 still remains in its drawn upper end position.
  • the embodiment of the air motor according to FIG. 4 differs from that of FIGS. 1 to 3 only in that the reversing valve is not mounted next to the engine cylinder 10a, but rather is located above it, thus switching rod 21 and valve stem 14 being combined into a one-piece rod are. This is to be indicated by the reference number 14, 21.
  • the spring snap device is now seated on this arrangement, the rocker arms 27, 28 loaded by the torsion springs 25, 26 engaging in recesses which are located in the combined valve switching rod 14, 21. Otherwise, this air motor corresponds completely to that of FIG. 1, so that a repeated explanation of the components and the mode of operation is unnecessary.
  • FIG. 1 the embodiment according to FIG.
  • the transverse lever 20 is omitted and the air motor can be made slimmer, even if its overall height slightly exceeds that of the air motor from FIG. 1. It is evident that the spring snap connection can be used without any difficulties both in air motors with a lateral reversing valve and with a coaxial reversing valve. Of course, the latter type exists also the possibility of arranging the spring snap device between the cylinder-piston unit 11, 12 and the reversing valve 13.
  • FIG. 5 shows a modified embodiment of the torsion springs 25, 26.
  • Each of the two springs 25, 26 is in one piece, holds the associated rocker arm with its two spring ends, and is fixed to the housing in its bent-out central region.
  • the rocker arm shown consists of three interconnected individual parts, namely the part 30 which articulates around the torsion end of the spring 25, the cylinder part 31 engaging in an annular groove of the shift rod 21 and the plate web connecting the parts 30 and 31.
  • the plate web 32 is made of metal, whereas the parts 30 and 31 consist of a plastic of suitable hardness and a suitable coefficient of friction. This can further reduce the friction.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Actuator (AREA)
  • Gear-Shifting Mechanisms (AREA)
  • Mechanically-Actuated Valves (AREA)
  • Valve Device For Special Equipments (AREA)
  • Valve-Gear Or Valve Arrangements (AREA)
EP90109490A 1989-06-28 1990-05-18 Druckluftmotor Expired - Lifetime EP0405127B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT90109490T ATE87707T1 (de) 1989-06-28 1990-05-18 Druckluftmotor.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3921214A DE3921214A1 (de) 1989-06-28 1989-06-28 Druckluftmotor
DE3921214 1989-06-28

Publications (2)

Publication Number Publication Date
EP0405127A1 EP0405127A1 (de) 1991-01-02
EP0405127B1 true EP0405127B1 (de) 1993-03-31

Family

ID=6383799

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90109490A Expired - Lifetime EP0405127B1 (de) 1989-06-28 1990-05-18 Druckluftmotor

Country Status (3)

Country Link
EP (1) EP0405127B1 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
AT (1) ATE87707T1 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
DE (1) DE3921214A1 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4032970A1 (de) * 1990-10-17 1992-04-23 Wagner Int Druckluftmotor

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2261323B2 (de) * 1972-12-15 1974-11-21 Specken Ag, Zuerich (Schweiz) Luftmotor
DE3342388C3 (de) * 1983-11-24 1996-05-23 Wagner Wilhelm Wiwa Luftmotor für Farbspritzgeräte, Fettpressen und dergleichen
US4651583A (en) * 1985-04-16 1987-03-24 Nippon Cable System, Inc. Locking mechanism
DE3703529A1 (de) * 1987-02-06 1988-08-25 Rudolf Dipl Ing Goldin Hubkolbenmaschine

Also Published As

Publication number Publication date
EP0405127A1 (de) 1991-01-02
DE3921214C2 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) 1991-07-04
ATE87707T1 (de) 1993-04-15
DE3921214A1 (de) 1991-01-10

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